Touch display panel

ABSTRACT

A touch display panel includes an array substrate, a display medium layer, a filter substrate and a touch electrode layer. The array substrate includes a substrate and sub-pixel units. The filter substrate includes a filter layer. The filter layer includes color resists. Each of the color resists corresponds to each of the sub-pixels one by one and includes a first region, a second region and a third region. The touch electrode layer has a plurality of slits. The slits have normal projection areas A1, A2 and A3 over the first region, the second region and the third region. The first region, the second region and the third region have areas F1, F2, F3, respectively, and satisfy one of the relations of |(A1/F1)−[(A2+A3)/(F2+F3)]|&lt;10%, |(A2/F2)−[(A1+A3)/(F1+F3)]|&lt;10% or |(A3/F3)−[(A1+A2)/(F1+F2)]|&lt;10%.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Taiwan Application Serial Number109146273, filed Dec. 25, 2020, which are herein incorporated byreference in its entirety.

BACKGROUND Field of Invention

The present disclosure relates to a touch display panel.

Description of Related Art

Among the memory in pixel (MIP) display at present, the common typesthereof include reflective displays. The MIP display cannot display grayscale. The MIP display is similar to a normal display and can go with anon-cell touch panel (oTP). To reduce a mura issue, the on-cell touchdisplay has slits cut therein. The design of slits is related to thepixels.

To increase the gray scale display of the MIP display, the gray scalecan be controlled through the light-transmitting regions. Because thelight-transmitting regions has a smallest unit different from a smallestunit of the normal display. When it goes with the past on-cell touchpanel with the slit design rule, it is prone to the mura issue.

SUMMARY

Some embodiments of the present disclosure provide a touch display panelwith reduced visibility of touch electrode layer and decreased muraissue.

Some embodiments of the present disclosure provide a touch display panelincluding an array substrate, a display medium layer, a color filtersubstrate and a color filter substrate. The array substrate includes asubstrate and a plurality of sub-pixel units on the substrate. Thedisplay medium layer is on the array substrate. The color filtersubstrate includes a color filter layer and an opposite substrate. Thecolor filter layer is between the display medium layer and the oppositesubstrate. The color filter layer comprises a plurality of color resistsarranged in an array along a first direction and a second direction. Thefirst direction crosses the second direction. Each of the color resistscorresponds to each of the sub-pixel units one by one and comprises afirst region, a second region and a third region arranged along thefirst direction and overlapping the same sub-pixel unit. The colorfilter substrate is on the color filter substrate. The touch electrodelayer has a plurality of slits. The slits have normal projection areasA1, A2 and A3 over the first region, the second region and the thirdregion, respectively. The first region, the second region and the thirdregion have areas F1, F2 and F3, respectively, and satisfy one of thefollowing relations: |(A1/F1)−[(A2+A3)/(F2+F3)]|<10%,|(A2/F2)−[(A1+A3)/(F 1+F3)]|<10% or (A3/F3)−[(A1+A2)/(F1+F2)]|<10%.

Based on above, in the touch display panel in accordance with oneembodiment of the present disclosure, by the slits having normalprojection areas A1, A2 and A3 over the first region, the second regionand the third region, respectively, the first region, the second regionand the third region have areas F1, F2 and F3, respectively, and satisfyone of the following relations: |(A1/F1)−[(A2+A3)/(F2+F3)]|<10%,|(A2/F2)−[(A1+A3)/(F1+F3)]|<10% or (A3/F3)−[(A1+A2)/(F1+F2)]|<10%,thereby reducing a visibility of the touch electrode layer and reducingthe mura issue.

It is to be understood that both the foregoing general description andthe following detailed description are by examples, and are intended toprovide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention can be more fully understood by reading the followingdetailed description of the embodiment, with reference made to theaccompanying drawings as follows:

FIG. 1A is a cross-sectional view of a touch display panel according toone embodiment of the present disclosure.

FIG. 1B is a top view of the touch display panel of FIG. 1A.

FIG. 2 is a top view of a region R of FIG. 1B.

FIG. 3 is a top view of color resists of a color filter layer on theregion R of FIG. 1B.

FIGS. 4-9 are schematic diagrams of illuminating states of a firstreflective piece, a second reflective piece and a third reflective pieceof the sub-pixel unit of the touch display panel in accordance with oneembodiment of the present disclosure.

FIG. 10 is a partial cross-sectional view of the color filter substrateand the touch electrode layer of the touch display panel according toone embodiment of the present disclosure.

FIGS. 11-13 are top views of the sub-pixels according to one embodimentof the present disclosure.

DETAILED DESCRIPTION

The following disclosure provides many different embodiments, orexamples, for implementing different features of the invention. Specificexamples of components and arrangements are described below to simplifythe present disclosure. These are, of course, merely examples and arenot intended to be limiting. For example, the formation of a firstfeature over or on a second feature in the description that follows mayinclude embodiments in which the first and second features are formed indirect contact, and may also include embodiments in which additionalfeatures may be formed between the first and second features, such thatthe first and second features may not be in direct contact. In addition,the present disclosure may repeat reference numerals and/or letters inthe various examples. This repetition is for the purpose of simplicityand clarity and does not in itself dictate a relationship between thevarious embodiments and/or configurations discussed.

Further, spatially relative terms, such as “underlying,” “below,”“lower,” “overlying,” “upper” and the like, may be used herein for easeof description to describe one element or feature's relationship toanother element(s) or feature(s) as illustrated in the figs. Thespatially relative terms are intended to encompass differentorientations of the device in use or operation in addition to theorientation depicted in the figures. The apparatus may be otherwiseoriented (rotated 90 degrees or at other orientations) and the spatiallyrelative descriptors used herein may likewise be interpretedaccordingly.

FIG. 1A is a cross-sectional view of a touch display panel 10 accordingto one embodiment of the present disclosure. FIG. 1B is a top view ofthe touch display panel 10 of FIG. 1A. FIG. 2 is a top view of a regionR of FIG. 1B. FIG. 3 is a top view of color resists CF of a color filterlayer 108 of the region R of FIG. 1B. Reference is made to FIGS. 1A-3.The touch display panel 10 includes an array substrate 100, a displaymedium layer LC, a color filter substrate 102 and a touch electrodelayer 104. The array substrate 100 includes a substrate SB and aplurality of sub-pixel units P on the substrate SB. The touch electrodelayer 104 is on the color filter substrate 102. The display medium layerLC is on the array substrate 100. In the present embodiment, the displaymedium layer LC is, for example, a liquid crystal layer.

The color filter substrate 102 includes an opposite substrate 106 and acolor filter layer 108 on the opposite substrate 106. The color filterlayer 108 is between the display medium layer LC and the oppositesubstrate 106. That is, the color filter layer 108 is on one side of theopposite substrate 106 which faces the display medium layer LC. That is,the color filter layer 108 and the touch electrode layer 104 are onopposite sides of the opposite substrate 106. The substrate SB and theopposite substrate 106 may include glass, quartz, organic polymers orother suitable materials.

The color filter layer 108 is on the display medium layer LC. The colorfilter layer CF includes a plurality of color resists CF. The colorresists CF are arranged in an array along a first direction D1 and asecond direction D2. The first direction D1 crosses the second directionD2. For example, the first direction D1 is a longitudinal direction inFIGS. 2 and 3. The second direction D2 is a horizontal direction inFIGS. 2 and 3. The first direction D1 is perpendicular to the seconddirection D2. For example, the color resists CF may be red colorresists, green color resists or blue color resists.

The touch display panel 10 includes a display region AA and a peripheryregion PA. The periphery region PA surrounds the display region AA. Thetouch electrode layer 104 has touch electrode pieces 104 a arranged inan array. For example, the touch electrode pieces 104 a are arrangedalong the first direction D1 and the second direction D2.

Each of the color resists CF corresponds to each of the sub-pixel unitsP one by one and includes a first region CF1, a second region CF2 and athird region CF3 which overlap the same sub-pixel region P and arearranged along the first direction D1. That is, the first region CF1,the second region CF2 and the third region CF3 of the same color resistCF are color resists of the same color. By controlling the sub-pixelunit P corresponding to the first region CF1, the second region CF2 andthe third region CF3 to be bright on dark, a gray scale of the light canbe controlled. In the present embodiment, the sub-pixel unit P has asize different from sizes of the first region CF1, the second region CF2and the third region CF3. For example, the size of the sub-pixel unit Pis greater than the sizes of the first region CF1, the second region CF2and the third region CF3, respectively.

The touch electrode layer 104 is on the color filter layer 108. Thetouch electrode layer 104 has a plurality of slits 110. The slits 110have normal projection areas A1, A2 and A3 over the first region CF1,the second region CF2 and the third region CF3 respectively. The firstregion CF1, the second region CF2 and the third region CF3 have areasF1, F2 and F3, respectively, and satisfy one of the following relations:|(A1/F1)−[(A2+A3)/(F2+F3)]|<10%, |(A2/F2)−[(A1+A3)/(F1+F3)]|<10% or(A3/F3)−[(A1+A2)/(F1+F2)]|<10%. That is, in the same sub-pixel unit P, adifference between an area ratio of the slits 110 of those in the firstregion CF1, the second region CF2 and the third region CF3 that mustemit light at the same time and an area ratio of the slits 110 ofremaining ones is less than 10%. In the present embodiment, the secondregion CF2 is between the first region CF1 and the third region CF3.

For example, FIGS. 4-9 are schematic diagrams of a first reflectivepiece 122 a, a second reflective piece 122 b and a third reflectivepiece 122 c of the sub-pixel unit P of the touch display panel 10 (seeFIG. 3) according to one embodiment of the present disclosure. Referenceis made to FIG. 3, FIG. 4 and FIG. 5. For example, the normal projectionareas A1, A2 and A3 and the areas F1, F2 and F3 satisfy the followingrelations: |(A1/F1)−[(A2+A3)/(F2+F3)]|<10%. That is, the second regionCF2 and the third region CF3 must emit light at the same time (see FIG.4) or not emit light at the same time (see FIG. 5), thereby decreasing avisibility of the touch electrode layer 104 and reducing the mura issue.For example, in condition that each of the color resists CF correspondsto each of the sub-pixel units P one by one and includes a first regionCF1, a second region CF2 and a third region CF3 arranged along the firstdirection D1 and overlapping the same sub-pixel unit P, the mura issuecaused by all of the sizes of the first region CF1, the second regionCF2 and the third region CF3 being different from the size of thesub-pixel unit P can be solved.

Reference is made to FIG. 3, FIG. 6 and FIG. 7. In some otherembodiments, the normal projections A1, A2 and A3 and the areas F1, F2and F3 satisfy the following relations: |(A2/F2)−[(A1+A3)/(F1+F3)]|<10%.That is, the first region CF1 and the third region CF3 must emit lightat the same time (see FIG. 6) or not emit light at the same time (seeFIG. 7), thereby decreasing the visibility of the touch electrode layer104 and reducing the mura issue. For example, in condition that each ofthe color resists CF corresponds to each of the sub-pixel units P one byone and includes a first region CF1, a second region CF2 and a thirdregion CF3 arranged along the first direction D1 and overlapping thesame sub-pixel unit P, the mura issue caused by all of the sizes of thefirst region CF1, the second region CF2 and the third region CF3 beingdifferent from the size of the sub-pixel unit P can be solved.

Reference is made to FIG. 3, FIG. 8 and FIG. 9. In some otherembodiments, the normal projections A1, A2 and A3 and the areas F1, F2and F3 satisfy the following relations: |(A3/F3)−[(A1+A2)/(F1+F2)]|<10%.That is, the first region CF1 and the second region CF2 must emit lightat the same time (see FIG. 8) or not emit light at the same time (seeFIG. 9), thereby decreasing the visibility of the touch electrode layer104 and reducing the mura issue. For example, in condition that each ofthe color resists CF corresponds to each of the sub-pixel units P one byone and includes a first region CF1, a second region CF2 and a thirdregion CF3 arranged along the first direction D1 and overlapping thesame sub-pixel unit P, the mura issue caused by all of the sizes of thefirst region CF1, the second region CF2 and the third region CF3 beingdifferent from the size of the sub-pixel unit P can be solved.

The slits 110 further include a second group of slit 120. The secondgroup of slit 120 extends along a fourth direction D4. The fourthdirection D4 crosses the first direction D1, the second direction D2 andthe third direction D3. The fourth direction D4 is not perpendicular tothe first direction D1, the second direction D2 and the third directionD3.

In the present embodiment, each of the color resists CF overlaps atleast one of the slits 110, thereby decreasing the visibility of thetouch electrode layer 104.

Referring back to FIG. 1A, in the present embodiment, the touch displaypanel 10 further includes an upper polarizer 112 and a lower polarizer114. The upper polarizer 112 is disposed on an outer surface of thetouch electrode layer 104. The lower polarizer 114 is disposed on anouter surface of the array substrate 100. However, the presentdisclosure is not limited thereto. In the present embodiment, the touchdisplay panel 10 further includes a sealant 116. The sealant 116 is, forexample, an optical adhesive. The sealant 116 surrounds the displaymedium layer LC and is between the array substrate 100 and the colorfilter substrate 102.

Thereafter, referring back to FIG. 3, the slits 110 include a firstgroup of slits 118. The first group of slits 118 extends along the thirddirection D3. The third direction D3 crosses the first direction D1 andthe second direction D2. The third direction D3 is not perpendicular tothe first direction D1 and the second direction D2.

FIG. 10 is a partial cross-sectional view of the color filter substrate102 and the touch electrode layer 104 of the touch display panel 10according to one embodiment of the present disclosure. Referring to FIG.3 and FIG. 10, the slits 110 expose a part of the area of the colorfilter substrate 102. In the present embodiment, the linear density ofthe slits 110 of the touch electrode layer 104 is greater than 65%.Reference is made to FIG. 3. For example, the first group of slits 118includes a first slit 118 a. The first slit 118 a has a length equal tob1 along the third direction D3. Two of the first group of slits 118closest to the first slit 118 a have a first shortest distance equal tox1 and a second shortest distance equal to x2 respectively from thefirst slit 118 a. A sum of the first shortest distance x1, the secondshorted distance x2 and the length b1 along the third direction is a1and satisfies the following relation: b1/a1>65%, thereby reducing avisibility of the touch electrode layer 104 and reducing the mura issue.

Referring back to FIG. 3, each of the sub-pixel units P of the arraysubstrate 100 includes a plurality of reflective pieces 122. Thereflective pieces 122 are disposed on the substrate SB and separatedwith each other. Each of the reflective pieces 122 corresponds to eachof the first region CF1, the second region CF2 and the third region CF3of each of the color resists CF one by one. The reflective pieces 122include metal and reflect light to the display medium layer LC to allowthe display region AA display an image. In the present embodiment, thetouch display panel 10 is a reflective display panel.

FIGS. 11-13 are top views of the sub-pixel units P according to oneembodiment of the present disclosure. Referring to FIG. 11, each of thesub-pixel units P further includes a plurality of pixel memory circuits124. The pixel memory circuits 124 are electrically connected to thereflective pieces 122. The reflective pieces 122 include a firstreflective piece 122 a, a second reflective piece 122 b and a thirdreflective piece 122 c. The first reflective piece 122 a, the secondreflective piece 122 b and the third reflective piece 122 c correspondto the first region CF1, the second region CF2 and the third region CF3of each of the color resists CF. The pixel memory circuits 124 include afirst circuit 124 a. The first circuit 124 a is electrically connectedto one of the first reflective piece 122 a, the second reflective piece122 b and the third reflective piece 122 c and not electricallyconnected to another one thereof. For example, referring to FIG. 11,FIG. 4 and FIG. 5, the first circuit 124 a is electrically connected tothe first reflective piece 122 a, and the first circuit 124 a is notelectrically connected to the second reflective piece 122 b and thethird reflective piece 122 c. That is, the first circuit 124 a cancontrol whether the first reflective piece 122 a is dark (see FIG. 4) orbright (see FIG. 5) and cannot control whether the second reflectivepiece 122 b and the third reflective piece 122 c are bright or dark. Thepixel memory circuit 124 further includes a second circuit 124 b. Thesecond circuit 124 b is electrically connected to the second reflectivepiece 122 b and the third reflective piece 122 c. That is, the secondcircuit 124 b can control whether the second reflective piece 122 b andthe third reflective piece 122 c are dark (see FIG. 5) or bright (seeFIG. 4). By the above-mentioned configuration, a desired gray scale canbe shown. In some embodiments, the first circuit 124 a and the secondcircuit 124 b are located along an arrangement direction of the firstregion CF1, the second region CF2 and the third region CF3 (see FIGS.11-13). However, the present disclosure is not limited thereto. In someother embodiments, the first circuit 124 a and the second circuit 124 bcan be located on left and right sides of the first region CF1, thesecond region CF2 and the third region CF3.

Referring to FIG. 12, FIG. 6 and FIG. 7, in some other embodiments, thefirst circuit 124 a is electrically connected to the second reflectivepiece 122 b, and the first circuit 124 a is not electrically connectedto the first reflective piece 122 a and the third reflective piece 122c. That is, the first circuit 124 a can control whether the secondreflective piece 122 b is dark (see FIG. 6) or bright (see FIG. 7) andcannot control whether the first reflective piece 122 a and the thirdreflective piece 122 c are bright or dark. The second circuit 124 b iselectrically connected to the first reflective piece 122 a and the thirdreflective piece 122 c. That is, the second circuit 124 b can controlwhether the first reflective piece 122 a and the third reflective piece122 c are dark (see FIG. 7) or bright (see FIG. 6). By theabove-mentioned configuration, a desired gray scale can be shown.

Referring to FIG. 13, FIG. 8 and FIG. 9, in some other embodiments, thefirst circuit 124 a is electrically connected to the third reflectivepiece 122 c, and the first circuit 124 a is not electrically connectedto the first reflective piece 122 a and the second reflective piece 122b. That is, the first circuit 124 a can control whether the thirdreflective piece 122 c is dark (see FIG. 8) or bright (see FIG. 9) andcannot control whether the first reflective piece 122 a and the secondreflective piece 122 b are bright or dark. The second circuit 124 b iselectrically connected to the first reflective piece 122 a and thesecond reflective piece 122 b. That is, the second circuit 124 b cancontrol whether the first reflective piece 122 a and the secondreflective piece 122 b are dark (see FIG. 9) or bright (see FIG. 8). Bythe above-mentioned configuration, a desired gray scale can be shown.

Based on above, according to one embodiment of the present disclosure,each of the color resists corresponds to each of the sub-pixel units oneby one and comprises a first region, a second region and a third regionarranged along the first direction and overlapping the same sub-pixelunit. The touch electrode layer has a plurality of slits. The slits havenormal projection areas A1, A2 and A3 over the first region, the secondregion and the third region, respectively. The first region, the secondregion and the third region have areas F1, F2 and F3, respectively, andsatisfy one of the following relations: |(A1/F1)−[(A2+A3)/(F2+F3)]|<10%,|(A2/F2)−[(A1+A3)/(F1+F3)]|<10% or (A3/F3)−[(A1+A2)/(F1+F2)]|<10%,thereby reducing the visibility of the touch electrode layer andreducing the mura issue.

Based on above, in the display panel according to one embodiment of thepresent disclosure, the first connecting electrode encapsulates thelight emitting layer such that the normal projection of the lightemitting layer over the array substrate is within the normal projectionof the first connecting electrode over the array substrate. Therefore,the first connecting electrode can shade the upper output light of thelight emitting diode and reflect this upper output light, therebyincreasing the brightness of the lower output light of the lightemitting diode and allowing the light emitting diode provide uniformlight field. Therefore, the display panel in accordance of oneembodiment of the present disclosure has good lower output lightefficiency. Based on a similar reason, the tiled display in accordanceof one embodiment of the present disclosure has good lower output lightefficiency.

Although the present invention has been described in considerable detailwith reference to certain embodiments thereof, other embodiments arepossible. Therefore, the spirit and scope of the appended claims shouldnot be limited to the description of the embodiments contained herein.

It will be apparent to those skilled in the art that variousmodifications and variations can be made to the structure of the presentinvention without departing from the scope or spirit of the invention.In view of the foregoing, it is intended that the present inventioncover modifications and variations of this invention provided they fallwithin the scope of the following claims.

What is claimed is:
 1. A touch display panel, comprising: an arraysubstrate comprising a substrate and a plurality of sub-pixel units onthe substrate; a display medium layer on the array substrate; a colorfilter substrate comprising a color filter layer and an oppositesubstrate, wherein the color filter layer is between the display mediumlayer and the opposite substrate, the color filter layer comprises aplurality of color resists arranged in an array along a first directionand a second direction, the first direction perpendicular to the seconddirection, wherein each of the color resists corresponds to a particularone of the sub-pixel units and comprises a first region, a second regionand a third region arranged along the first direction and overlappingthe particular one of the sub-pixel unit; and a touch electrode layer onthe color filter substrate, wherein the touch electrode layer has aplurality of slits, the slits have normal projection areas A1, A2 and A3over the first region, the second region and the third region,respectively, the first region, the second region and the third regionhave areas F1, F2 and F3, respectively, and satisfy one of the followingrelations: |(A1/F1)−[(A2+A3)/(F2+F3)]|<10%,|(A2/F2)−[(A1+A3)/(F1+F3)]|<10% or |(A3/F3)−[(A1+A2)/(F1+F2)]|<10%;wherein the normal projection areas A1, A2, and A3 are positioned insidethe color resists without overlapping a boundary of the particular oneof the sub-pixel units.
 2. The touch display panel of claim 1, whereineach of the color resists overlaps at least one of the slits.
 3. Thetouch display panel of claim 1, wherein the slits comprises: a firstgroup of slits extending along a third direction, wherein the thirddirection crosses the first direction and the second direction, thefirst group of slits comprises a first slit, two of the first group ofslits closest to the first slit have a first shortest distance equal tox1 and a second shortest distance equal to x2 respectively from thefirst slit, the first slit has a length equal to b1 along the thirddirection, a sum of x1, x2 and b1 is a1 and satisfies the followingrelation: b1/a1>65%.
 4. The touch display panel of claim 3, wherein theslits further comprises: a second group of slits extending along afourth direction, wherein the fourth direction crosses the firstdirection, the second direction and the third direction.
 5. The touchdisplay panel of claim 1, wherein each of the sub-pixel units of thearray substrate comprises: a plurality of reflective pieces disposed onthe substrate and separated with each other, wherein each of thereflective pieces corresponds to the first region, the second region andthe third region of each of the color resists one by one.
 6. The touchdisplay panel of claim 5, wherein the reflective pieces include metal.7. The touch display panel of claim 5, wherein each of the sub-pixelunits further comprises: a plurality of pixel memory circuitselectrically connected to the reflective pieces, wherein the reflectivepieces comprise a first reflective piece, a second reflective piece anda third reflective piece, the first reflective piece, the secondreflective piece and the third reflective piece correspond to the firstregion, the second region and the third region of each of the colorresists, respectively, the pixel memory circuits comprise a firstcircuit electrically connected to one of the first reflective piece, thesecond reflective piece and the third reflective piece and notelectrically connected to another one thereof.
 8. The touch displaypanel of claim 7, wherein the first circuit is electrically connected tothe first reflective piece, and the first circuit is not electricallyconnected to the second reflective piece and the third reflective piece.9. The touch display panel of claim 7, wherein the first circuit iselectrically connected to the second reflective piece, and the firstcircuit is not electrically connected to the first reflective piece andthe third reflective piece.
 10. The touch display panel of claim 7,wherein the first circuit is electrically connected to the thirdreflective piece, and the first circuit is not electrically connected tothe first reflective piece and the second reflective piece.
 11. Thetouch display panel of claim 1, wherein each of the color resistscompletely overlap each of the plurality of slits of the particular oneof the sub-pixel unit, and each of the plurality of slits extend fromthe second region to either the first region or the third region.